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3 years ago

You are a plumber, and you are repairing a toilet leak. The job should take 0.9 hours. About how many minutes will it

Mathematics

2 answers:

monitta3 years ago

6 0

Answer:

Step-by-step explanation:

multiply 60 by 0.9 and you get 54..?

anzhelika [568]3 years ago

3 0

Answer:

Step-by-step explanation:

0.1 is 10% of 1 and was subtracted off so we subtract 10% off 60 so 60 x 10% = 6

60 - 6 = 54

Hope this helps can I have brainliest

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Solve (x + 3)2 + (x + 3) – 2 = 0. Let u = Rewrite the equation in terms of u. (u2 + 3) + u – 2 = 0 u2 + u – 2 = 0 (u2 + 9) + u –

Verdich [7]

Answer:

The solutions of the original equation are x=-5 and x=-2

Step-by-step explanation:

we have

$(x+3)^2+(x+3)-2=0$

Let

$u=(x+3)$

Rewrite the equation

$(u)^2+(u)-2=0$

Complete the square

$u^2+u=2$

$u^2+u+1/4=2+1/4$

$u^2+u+1/4=9/4$

rewrite as perfect squares

$(u+1/2)^2=9/4$

square root both sides

$(u+1/2)=\pm\frac{3}{2}$

$u=(-1/2)\pm\frac{3}{2}$

$u=(-1/2)+\frac{3}{2}=1$

$u=(-1/2)-\frac{3}{2}=-2$

the solutions are

u=-2,u=1

<em>Alternative Method</em>

The formula to solve a quadratic equation of the form

$ax^{2} +bx+c=0$

is equal to

$x=\frac{-b\pm\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$(u)^2+(u)-2=0$

$a=1\\b=1\\c=-2$

substitute in the formula

$u=\frac{-1\pm\sqrt{1^{2}-4(1)(-2)}} {2(1)}$

$u=\frac{-1\pm\sqrt{9}} {2}$

$u=\frac{-1\pm3} {2}$

$u=\frac{-1+3} {2}=1$

$u=\frac{-1-3} {2}=-2$

the solutions are

u=-2,u=1

<em>Find the solutions of the original equation</em>

For u=-2

$-2=(x+3)$ ----> $x=-2-3=-5$

For u=1

$1=(x+3)$ ----> $x=1-3=-2$

therefore

The solutions of the original equation are

x=-5 and x=-2

4 0

3 years ago

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Melody paid for a scarf with a ten dollar bill her change was two dollar three quarters and two dimes how much was the scarf

olya-2409 [2.1K]

Answer:

Step-by-step explanation:

10 -2.95 = 7.05

the scarf cost $ 7.05

7 0

2 years ago

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Can someone please answer this question please answer it correctly and please show work please help me I need it

Oksana_A [137]

Answer:

Step-by-step explanation:

Question: 10 - 8 = 2

A = (-18)

B = 18

C = 2

D = (-2)

6 0

3 years ago

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The area of a rectangle is 336 square inches. If the width of a rectangle is 6 inches. What is the length of the rectangle?

Hoochie [10]

The length of the rectangle is 56

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3 years ago

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An office supply company manufactures paper clips, and even tolerates a small proportion of those paper clips being ‘defective’

vovikov84 [41]

Answer:

0.104 (10.4%)

Step-by-step explanation:

$UCL = \bar{p}+z(\sigma)$

$\sigma = p(1-)) Vn = 1.02(1-202)) 5$ = 0.028

$\thereforeUCL = .02+(3x0.028)$ = 0.104

$\thereforeUCL$ = 10.4%

4 0

3 years ago